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Term 1: Term 2:

(subclass Coal Mineral) Geography.kif 2017-2017 子類 煤 and Mineral
(subclass Coal FossilFuel) Geography.kif 2018-2018 子類 煤 and 化石燃料
(subclass Coal Rock) Geography.kif 2019-2019 子類 煤 and 岩石
(subclass BrownCoal Coal) Geography.kif 2003-2003 子類 褐煤 and 煤


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